Electromagnetic circuit closer



l.. RElcHoLD 1,962,033

ELECTROMAGNETIC CIRCUIT CLOSER June 5,. 1934.

Filed Jan. 5. 1951 2 sheets-snm 1 llllllllllllllllllllllh June 5, 1934.L. RElcHoLD ELECTROMAGNETIC CIRCUIT CLOSER Filed Jan. 5, 1931 2Sheets-Sheet 2 Patented June 5, 1934 UNITED STATES PATENT OFFICEELECTROMAGNETIC CIRCUIT CLOSER Application January 5, 1931, Serial No.506,770

2 Claims.

This invention relates to improvements in electric ranges, and moreparticularly concerns means for controlling the supply of current to theheater plates and auxiliary devices.

i One object of the invention is to provide an electric range having atiming clock for controlling the energization of the heating unitsthereof, and means whereby this same timing clock may be employed forcontrolling the energization of an auxiliary device.

Another feature of the invention is the provision of an electric rangehaving a timing and thermostatic control of the oven elements thereof,together with means whereby the timing control may be employed with anauxiliary electric device even though the oven elements are not inoperation.

A further feature of the invention is the provision in an electric rangeof a circuit breaker which is controlled by a timing clock and athermostat, and which may be employed in conjunction with the ovenheating elements, and also with auxiliary electrical apparatus.

Other features of the invention appear in the course of the followingspecification and drawings.

An illustrative form of construction of the device according to thepresent invention is set forth on the accompanying drawings, in which:

Fig. 1 is a plan view of an electro-magnetic circuit breaker accordingto the invention.

Fig. 2 is a transverse sectional View of the same, substantially on line2-2 of Fig. 1.

Fig. 2a is a detailed elevation of the contact j structure of the same.

Fig. 3 is a horizontal-sectional View of a portion of the contactstructure, substantially on line 3--3 of Fig. 2.

Fig. 4 is a wiring diagram of the circuit breaker l4t) parts.

Fig. 5 is a perspective view of the rocker plate which supports themovable contact structure. Fig. 6 is a circuit diagram of theconnections of the device. Fig. 6a is a fragmentary View showing themodied form of connecting the power main wires to a network having twoconductors only.

In these drawings, the circuit breaker is shown as comprising aninsulating base block 10 having bushings 11 at its corners, by which itmay be fastened to the frame work of the entire device. Theelectro-magnetic operating coils 12, 13 are preferably wound on squaretubes 14' (Fig. 2) which provide an air core for the respectiveelectro-magnets. The clamping plates 15 are of Stirrup shape and passthrough the core tubes 14 and are secured at their ends by the posts 16and the screws 17 which engage the base plate 10.

A vertical central pivot 18 is likewise mounted in the base member 10and passes through the horizontally bent ears 19 (Fig. 5) of a contactsupporting plate 20, which has a horizontally bent upper projection 21,with a notch 22 therein, and the lugs 23 for clamping and supporting aninsulating sheet 24.

The supporting member 20 also has openings 25 to receive the rivets 26,which hold a stifenng plate 27 in position. Mounted on the insulatingsheet 25 by pairs of rivets 28, are upper and lower contact blades 29,30, having the contact points 31 thereon, these contact blades beingheld apart in insulated relation to one another by the sheet 24. Locatedbetween the Contact blade 30 and the sheet 24 is the straight end of apig-tail connection 32 of thin flexible sheet metal which is 75 curvedaround the vertical pivot post 18 so that it is free of contacttherewith, and having its other end connected by a screw 33 to the post34 which has a conductive screw 35 extending through the base plate l0and holding it in po- 8 0 siticn. Similarly, the end of a curvedpig-tail connection 36 is secured between the contact blade 29 and theplate 24 and extendsaround the pivot 18 and is held by a screw 33 to thepost 37 which likewise has a conductive screw 85 support 38 passingthrough the base plate 10.

A rocker is mounted on the vertical post 18 between the inturned ears 19of the plates 20 and comprises a sleeve 40 surrounding the post 18 andhaving a radially extending arm 41 provided with the arcuatelypositioned arms 42 (Fig. 1) which may rock into and out of positions inthe air cores of the electro-magnets 12, 13, as shown by full and dottedlines in Fig. 1. The end 43 of the radial arm 41 is adapted to 95 engagethe stop lugs 44, 45 of the columns 16. Upstanding from the radial arm41 is a bracket 46, having an aperture 47 therein. The toggle spring 48is connected at its ends in the aperture 47 and in the notch 22 of theplate 20.

On the base plate 10 is secured an L-shaped fixed contact 50, by screws51, which on its vertical portion has an upper fiber member 52 and alower conductive contact 53, the members 52 and 53 being locatedopposite the contact points 31 of the contact arms 29, 30.

The base plate 10 also has an L-shaped fixed contact member 60 with acontact point 61 on its vertical end. A further iixed contact support 62has a horizontal portion which is parallel to the horizontal portion ofthe L-shaped fixed contact and is spaced therefrom by an insulatingmember 63. This L-shaped member 62 also has a vertical portionsubstantially aligned above the vertical portion of 'the ilxed contact60 and provided with a contact point 64. The contact points 61 and 64are likewise located opposite the movable contact points 31. The bindingposts 65, 66, pass through the fixed contact supports 60, 62 and theinsulation 63 to hold these parts in position, in conjunction with asecuring screw 67.

The circuit breaker thus described is wired so that the terminals of theelectro-magnetic coil 12 pass to contact posts 70, 71, which areconnected within the base plate 10, by a conductor 72 which passes toone of the securing screws 51, and by a conductor 73 to a binding post74. The terminals of the electro-magnetic coil 13 are connectedrespectively to the binding post 75 and to a terminal post 76 from whicha conductor 77 leads to the binding post 66 and thus to the fixedcontact 61. The conductive supporting screw 35 of the post 34 isconnected by a conductor 77, to a binding post 78, while the conductorscrew 33 of the post 37 is connected by a conductor '79 to a bindingpost 80.

The binding post 81 has no electrical connection within the circuitbreaker in the form illustrated.

In the circuit diagram of Fig. 6, there is shown an electric rangehaving the three oven heating units IDOL-100", 101e- 10112 1021-1021, onthe top, commonly known as "top plate units: and the heating units1036--1032 10421--104b in the oven. Each of these units is divided asshown, and is connected to a control switch 100s, 1015, 102, 103, 104s,of a suitable type for connecting the units in proper relationship tothe electric means whereby the heating of the respective plates may becontrolled as desired. Thus, in the figures, the switch 100s is shown inposition to connect the heating units for the highest temperature: theswitch 101s for a medium temperature, and the switch 102s for a lowtemperature.

A timing clock of any desired type is provided, which operates the oncontact 110 to close a timing circuit and the olf contact 111 to open atiming circuit as will be described more in detail hereinafter. Sincethe construction of such a timing switch is not a, part of the presentinvention, no detailed showing of the mechanism is set forth. The onswitch contact 110 selectively engages the contacts 112, 113 or thecontacts 114, 115, to connect the same together. Similarly, the offcontact member 111, selectively connects the fixed contacts 116, 117 orthe fixed contacts 118, 119.

A thermostat switch comprising in the conventional showing a bimetallicbar 120, is adapted selectively to engage the contact 121 when thethermostat has been heated.

A single pole receptacle switch 123 has the central terminal 124 and theend terminals 125,

A plug-in receptacle 127 of suitable type is provided on the range.

from conductor 140 to the binding post 80 and thence to the upper movingcontact blade 29, as conventionally shown in Fig. 6, so that in oneposition of the toggle switch, a current may flow to the xed contact 64,binding post 65, by conductor 144 to the switches 1035, 1045, throughthe heating plates of the oven, and back by the conductor 142 to theline, and from fixed contact 61, by binding post 66, and conductor 145;so that all three conductors 140, 141, 142 are connected to the heatingplate switches.

In the opposite position ol the circuit breaker parts, ar circuit isestablished from conductor 142 by conductor 148, conductor 149, bindingpost 81, conductor 150, the thermostat blade 122, contact 121 (when thetemperature of the oven is below a pre-determined maximum), conductor151 to contact 114, through the on contact member 110, contact 115,conductor 152, contact 118, through the off switch member 111, (when inthe lower position), Contact 119, conductor 153, binding post 74,conductor 73, electro-magnetic coil 12, conductor 72, coil 12, fixedcontact 53, movable contact blade 30, conductor 146, binding post 78,conductor 147, back to the main conductor 141, whereby the coil l2 isenergized and 'the sector arm 42 is moved in a clockwise direction inthe figures, until ultimately, the toggle spring 43 operates to move thecontact blades 29, 30, quickly from the full line position in Fig. 1,into the dotted line position of that figure.

If the contacts are in the dotted line position of Fig. 1 and thethermostat switch is moved by the action of a maximum pre-determinedheat in the oven until it engages the thermostat contact 122, then acircuit is closed which passes from conductor 142 by conductors 148,149, 150 to the thermostat blade 120, contact 122, conductor 154,conductor 155, binding post 75, electro-magnetic coil 13, conductor 77,xed contact 61, movable switch blade 30, conductors 146 and 147, back tothe main conductor 141. The coil 13 is thus energized and the rockingsector 42 is moved in a counter-clockwise direction in the iigures untilthe toggle spring 48 again operates to snap the contact blades 29, 30from the position shown in dotted lines to the position shown in fulllines. This opens the circuit extended by conductors 144, 145 to theoven switches and units, and deenergizes these oven units so that theoven tends 125 to cool.

The contacts 112 and 117 of the clock switch are connected by aconductor 156 and the conductor 155 to the binding post 75. Similarly,the contacts 113 and 116 are connected by con- 130 ductor 157 to thebinding post 81 and thus to the conductors 149, 150.

It will be understood that the contact member 110 is normallyconstructed for closing at a predetermined time as the result of theoperation of 135 the clock movement, its closed position being the lowerposition as indicated. The contact member 111 is constructed so that itwill operate quickly to instantaneously break the time controllingcircuit by moving from the dotted lower 140 position in Fig. 6, into thefull line Lipper position. When both contacts 110 and 111 are in thelower position, the circuit is closed from conductors 151 to conductor153 as described above, but when one or the other, or both of thecontact members 145 110, 111 are in the upper position in Fig. 6, thiscircuit is opened, and the conductors 155 and 157 are connected directlytogether. Current thus may flow from conductor 142 by conductors 148,149, 147, to conductor 155 and thus to binding 150 post 75,electro-magnetic coils 13, conductor 77, iixed contact 61, movablecontact blade 30, conductors 146 and 147, back to the main conductor141: whereby the circuit breaker is moved into the open position and theoven is disconnected from the circuit, as for example, at the end of theprescribed time.

It will be noted that the receptacle 127 is connected by conductor 148to the main line conductor 142 and by a conductor 158 to the centralterminal of the receptacle switch 124. If the switch is thrown to theleft hand position, the receptacle 127 is then connected by theconductors 157, 159 to the main conductor 140. If the receptacle switchis thrown to the right hand position, a circuit is established from themain conductor 142 by conductor 148 to the receptacle 147, with a returnby the conductor 158 to the central terminal 124 through the switchblade to the terminal 126, by conductor 144 to binding post 65, thenceto the xed contact 64, and by the movable switch blade 29 and conductor142 back to the main conductor 140. The time clock, therefore, by thesuccessive energization of the electro-magnetic coils 12 and 13 of thecircuit breaker will at the prescribed times, first close the circuitthrough the receptacle and then open it again. Thus, the single timeclock on the range serves to control the times of heating anddisconnection of the oven, and also the times of connection anddisconnection through the receptacle. Further, the receptacle may beoperated directly from the mains without any control by the clock: orthe clock circuits may be so connected that both the receptacle and theoven heating elements may be controlled by the same circuit breaker.

It is obvious that the invention is not limited to the form ofconstruction shown, but that it may be employed in many ways within thescope of the appended claims.

Having thus described the invention, what I claim as new and desire tosecure by Letters Patent, isz- 1. In a circuit closer, a frame, a pairof electromagnet coils, stirrups for mounting said coils on said frame,securing means for holding said stirrups to said frame including anupstanding post for each of said stirrups, a pivot mounting on saidframe, an oscillatable armature journaled on said pivot mounting andincluding a sector adapted to be selectively attracted by saidelectromagnet coils when energized whereby to rock said core on saidpivot mounting, and a stop carried by said armature and adapted toengage selectively one of said posts whereby to limit the rockingmovement of said armature.

2. In a circuit closer, a frame, a pair of electromagnet coils, stirrupsfor mounting said coils on said frame, securing means for holding saidstirrups to said frame including an upstanding post for each of saidstirrups, a pivot mounting on said frame, an oscillatable armaturejournaled on said pivot mounting and including a sector adapted to beselectively attracted by electromagnets when energized whereby to rocksaid core on said mounting, and a stop carried by said armature andadapted to engage selectively one of said posts whereby tolimit therocking movement of said armature, a switch blade support journaled onsaid pivot mounting and a toggle spring connecting said switch supportto said armature, a switch blade insulatedly mounted on said switchsupport and a iixed contact on said frame for engagement by said switchblade.

LUDWIG REICHOLD.

